In no case shall an employee receive less than a day's pay or night's pay at the straight time rate except when discharged for cause or excused at their own request. The full shift provision shall not apply where plant operations affecting the particular employee's job are interrupted for reasons beyond the control of the Employer such as fire, explosion, power failure or acts of God. Where the interruption of work occurs after the employee has punched in and started work, the employee shall receive pay for the full shift, regardless of the reason for the interruption. Whenever work is scheduled for Saturdays, Sundays or holidays, the employee shall be guaranteed five (5) hours work at applicable rates.